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lammps/lib/atc/WeakEquationPoisson.h
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WeakEquationPoisson.h
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#ifndef WEAK_EQUATION_POISSON_H
#define WEAK_EQUATION_POISSON_H
#include <set>
#include <string>
#include "WeakEquation.h"
namespace ATC{
/**
* @class WeakEquationPoisson
* @brief Poisson equation
* 0 = perm grad^2 \phi + \rho -->
* \int B^T perm B dv \phi = \int N^T \rho dv
*/
class WeakEquationPoisson : public WeakEquation {
public:
// constructor
WeakEquationPoisson();
// destructor
virtual ~WeakEquationPoisson(){};
/** flux that is integrated with B = Grad N as its weight */
virtual bool has_B_integrand(void) const {return true;}
virtual void B_integrand(const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT_VEC &flux) const ;
/** flux that is integrated with N as its weight */
//virtual bool has_N_integrand(void) const {return false;}
virtual bool has_N_integrand(void) const {return true;}
virtual bool N_integrand(const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT &flux) const ;
/** linear RHS stiffness matrix */
virtual bool has_BB_tangent_coefficients(void) const {return true;}
virtual void BB_tangent_coefficients(const FieldName field,
const FIELD_MATS &fields,
const Material * material,
DENS_MAT &coefs) const;
/** linear RHS stiffness matrix */
virtual bool has_NN_tangent_coefficients(void) const {return true;}
virtual void NN_tangent_coefficients(const FieldName field,
const FIELD_MATS &fields,
const Material * material,
DENS_MAT &coefs) const;
/** necessary interfaces */
virtual std::set<std::string> needs_material_functions(void) const
{
std::set<std::string> needs;
needs.insert("electric_displacement");
needs.insert("electron_charge_density");
return needs;
}
};
/**
* @class WeakEquationPoissonConstantRHS
* @brief Poisson equation with constant RHS
*/
class WeakEquationPoissonConstantRHS : public WeakEquationPoisson {
public:
// constructor
WeakEquationPoissonConstantRHS();
// destructor
virtual ~WeakEquationPoissonConstantRHS(){};
/** flux that is integrated with B = Grad N as its weight */
virtual bool has_B_integrand(void) const {return true;}
virtual void B_integrand(const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT_VEC &flux) const
{ WeakEquationPoisson::B_integrand(fields, grad_fields, material, flux) ; }
/** flux that is integrated with N as its weight */
virtual bool has_N_integrand(void) const {return true;}
virtual bool N_integrand(const FIELD_MATS &fields,
const GRAD_FIELD_MATS &grad_fields,
const Material * material,
DENS_MAT &flux) const ;
/** rhs is constant */
virtual bool has_NN_tangent_coefficients(void) const {return false;}
virtual void NN_tangent_coefficients(const FieldName field,
const FIELD_MATS &fields,
const Material * material,
DENS_MAT &coefs) const {};
virtual std::set<std::string> needs_material_functions(void) const
{
std::set<std::string> needs;
needs.insert("electric_displacement");
return needs;
}
};
}; // namespace
#endif
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